1 Answer
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The PPA is built for testing and for fixing obscure bugs with certain releases. It currently has xorg version 2:1.9.2.901+git20101129 and you may be looking for 902 instead of 901, but try it because it'll get you most of the way there and it's likely it'll be updated anyway.

What ever you do, don't compile yourself. If you feel the urge to DIY, please build some deb packages for yourself instead. More details here: